What makes roof winter prep in Newmarket its own problem
The honest summary of roof winter prep in Newmarket is that the work is simple and the diagnosis is not.
Older Newmarket stock was built when soft lime mortar and clay liners were the standard; modern high-efficiency appliances vent very differently, and the mismatch causes condensation the original builder never planned for.
Wind loading off Lake Ontario pushes driving rain against the south and west faces of a house, which is why water entry so often shows up on one side of a Newmarket home and nowhere else.
Across Historic Downtown, Armitage, Stonehaven-Wyndham, Central Newmarket and Huron Heights-Leslie Valley, the housing stock changes street by street, and the correct method changes with it. A century home with a soft-brick stack does not get the same treatment as a 2010 build with a factory-built vent — using one method on both is how systems get damaged.
the practical takeaway is that a roof winter prep visit should start with an assessment, not a tool. Any crew that begins work before telling you what they found is guessing on your behalf.

